Manufacture of links for chain cables



Aug. 22, 1933. Q HEDFQRS 1,923,201

MANUFACTURE OF LINKS EOR CHAIN CABLES I Filed July 21, 1931 i 2 Sheets-Sheet 1 INVENTOR ARVID O. HEDFOR-S ATTORNEY A'u .22, 1933. A0 H R 1,923,201

MANUFACTURE OF LINKS FOR CHAIN CABLES Filed July 21, 1931 '2 SheetsSheet 2 .INVENTOR ARVID O. HEDFoRs Patented Aug. 22, v 1933 Arvid Otto Hedi'ors, Stockholm, Sweden Application July 21, 193 1,Serial No. 552,258, ad

in Sweden September 4, 1929 1 Claim.

This invention relates to an improved method of manufacturing links for so called Ewarts chain cable. Hereby the initial material consists of a material which is adapted to be bent in a cold condition and also to be hardened if desired. I

The process of manufacture is characterized thereby that the cutting of the link blank proper is carried out by means of a combined or composed tool in such a manner that the holeand outer edges become finished by only one pressing operation. The forming of the contour of the link and a suitable bending of the tongue is carried out by means of a combined tool, said tool operating in the horizontal as well as in the vertical direction, when the pressing tool is pushed down, thus fixing the inner as well as the outer contour of the tongue. The stamping and ready-bending and planing of the link if desired is also carried out in a combined tool, operating in the horizontal as well as in the vertical direction when the press is pushed ,down and hereby the link obtains its correct divisioning and inner dimensions.

By this process a completely finished and uniform link of correct dimensions is obtained by three press operations.

The invention is illustrated in the accompanying drawings, where Figures 1-5 show the link in different steps of manufacture.

Figures 6-9 show the difierent tools for the manufacture of the link.

Hereby Figure 1 is a cross section and Figure 2 a plan view of the link-blank after the first pressing operation. 1

Figure 3 is a cross section of the link-blank after the second pressing operation whereas,

Figures 4 and 5 show the finished link after the third pressing.

Figure 6 shows the die appertaining to the first pressing tool, in plan view, whereby the blank is indicated by dash and dot lines.

Figure 7 is a cross section of the first pressing tool.

Figure 8 is a cross section of the second pressing tool whereas Figure 9 shows a detail of the third pressing tool.

In the drawings 1 indicates the link-blank and the finished link respectively, 2 the die and 3 the cover or the upper portion of the first pressing tool guiding the stamps. The stamps proper are indicated by 4and 5. The holes of the die for these stamps are indicated by 6 and '7 respective- 1y, besides whichthere is a hole 8 in the die for a third cutting stamp, not shown in the drawings.

During the first pressing operation the cutting out of the link-blank from the profiled roll material is carried out by one single pressing operation in such a way that the stamp 4 carries out the cutting of the inner hole 9 the stamp 5 forms the material for the book 10, besides which the stamp for the hole 8 cuts off the blank along the line '.r:r: of Figures 2 and 6. In large 6 links the hole 9 may be pressed out separately if desired. y

The feeding direction of the blank is indicated by the arrow in Figure 6.

During the second pressing operation the cut '70 out link is cut in the tool according to Figure 8, in' which the die is indicated by 11 and the stamp by 12. By this second pressing operation it is possible to obtain a more constant and smooth shape of the link than the link obtained by the rolling and cutting. The outer as well as the inner portions of the link are here contained by the tool and the die 11 as well as the stamp '12 are of such a shape that the hook 10 and the link are also formed and bent to a closer correspondence with the final shape. In order to facilitate hereby the bending of the hook there is arranged a piston 13, said piston being movable laterally and actuated by a spring 14, said spring urging the piston in the direction of the arrow. The piston is provided with an opening 15 running across the same, in which opening there runs an arm 16 pivoted on a bolt 1'7, which is fixed in a portion 18 movable up and down in the die 11. At its lower end the arm 16 is provided with an oblique surface 19, intended to cooperate with an oblique surface of the die 20 when the arm is moved downward. Further the die is provided with an adjustable stopping shoulder, preferably consisting of a screw 21.

During the pressing operation the stamp 12 is moved downwards and thus an operation is carried out in the vertical direction. When the stopping shoulder 21 bumps against the arm 16, said arm is pushed downward until the oblique surfaces 19, 20 meet one another, whereby the piston 13 is forced to the left against the action'ol' the spring 14 (in Figure 8). Consequentlythe piston 13 cooperates to bend the hook and thus the tool operates also in the horizontal direction.

The third pressing tool is similar to that just described and the second and third pressing tool may consist of one and the same tool. The only difference is that a cylindrical portion, prefera ly a bolt 23, is substituted 'for the portion 22 of the die 11, said bolt giving the hook 10 its final shape. In'tln's' case it has also proved to be suitable to provide the tool with a number indicating thesize in order that the link is pro-' vided with 'a cut number at the final ready-.

bending. q

Thus-links for Ewart's chain cables may be manufacturedaccurding to the invention cons derably more rapidly and more simply'than in processes of manufacture known hitherto.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

A method of manufacturing links for chains of the character described from profile rolled or drawn bar material in a cold state, comprising simultaneously shaping the m edgesof the v v link to form a tongue and punching an opening in the link to receive the tongue of a corresponding link in a single operation, placing the partially formed link on a die, simultaneously shaping the tongue and bending the end of the same downwardly over a portion of the die by app ying forces vertically and horizontally on the tongue of the link and finally placing the link on a die; positioning a shaping rod in the loop formed bythe partially bent tongue and simultaneously applying forces vertically and horizontally on said link to bend the tongue downwardly audhoiiaomtally about said rod, all of said steps being performed while the material is at substantially atmospheric temperature.

' 1 mvm OTTO HEDFORS'. 

